Joker is the hand to hand fighter, Cyclone Joker gets the agility of the wind so to speak and the Joker Extreme. Luna Joker get the stretching limbs, Heat Joker gets the fire punch.
Metal has the staff for mid range combat. Cyclone Metal is basic whirling staff style. Luna Metal gets a stretching staff and Heat Metal gets the burning staff and Metal Branding ability.
Trigger has the gun for long range. Cyclone Trigger shoots shockwave, Heat Trigger probably shoots fire blast and Luna Trigger has beams that bend like rubber.
One provides the mean of attack and the other the style.